Base-plug for time-fuses



C. G. HEIBY, J. BURKAM, D. E. LINDQUIST, F. L. RIGGIN, E. W. ALLEN AND R. LAU. BASE PLUG FO'R TIME FUSES.

APPLicATloN FILED 1m17.191s.

1 ,33 1,92 1 Patented Feb. 24, 1920.

m @www up@ Ch'sncqs UNITED sTATEs PATENTV oEEIoE.

CARL G. HEIBY, JOHN BURKAM, DAVID E. lL'IND-QUIST, FRED L. RIGGIN, EBENEZER W.

ALLEN, AND RICHARD LAU, F SARNIA), CANADA, ASSIGNORS,

BY MESNE AssIGN-.

MENTS, T0 MUELLER METALS COMPANY, 0F PORT HURON, MICHIGAN, A. CORPORA- 'rIoN or MICHIGAN.

y BASE-PLUG FOR TIME-FUSES.

pecication of Letters Patent'.

Patented Feb. 24, 1920.

Applicatie# led January 17,v 1918. Serial No. 212,231.`

ARD LAU, all citizens of the United States except ALLEN, a subject of Great Britain,

residing at Sarnia, in the county of Lamb' ton and Dominion of Canada, have invented new and useful Improvements in Base- Plugs for Time-Fuses, of which the following is a specification.

The present invention relates to forgmgs and particularly to forgings for base plugs for time fuses.

It has for its object to produce a forging by the use of which the work of machining and boring to produce the finished base plug dles'has the annular projecting fin or ,flash is very materially reduced, and there is a resultant saving in time and labor.

In order that the invention may be clear .to those skilled in the art there is shown in the accompanying drawings the several steps incident to the producti-on of the specific article herein shown to illustrate the invention, namely, a base 'plug for time fuses, the forging steps in the method from the slug to the finished product being shown.

In said drawings F'gure 1 is a view of a blank or slug suit-- able for the production of these articles.

Fig. 2 is a view in section of the slug nfter vit has been subjected to the action of the forging dies and before trimming.

Fig. 3 is apview in'section of a trimmed a5v forging.

a Fig. 4 is a view in section showing a fin- -ished base plug.

Referring to Y the drawings by numerals,

like numerals indicating like parts in the 40 several views, `10 indicates the plug which may be formed in any convenient manner either by casting as an individual slug, or it lnay be produced by Cutting from a cast, or' rolled or drawn rod, lengths of the requisite size to form a slug appropriate for the article to..be produced, these slugs being formed with a cubical content but slightly in excess of the cubical content of the article to be made. In the particular form of slug here shown, there is illustrated a cast slug, and in casting these individual slugs, there is at the top of the casting a slight amount ofimpure metal and dross, which impure tary part on one of the die members so as to center the slug accurately between the dies. The slug will then be subjected to the action of the dies and brought to the form shown in Fig. 2 having the body portion 13, the upstanding annular Wall 14 with the central cavity 15, the lower part 'of the forging having the projection 16 as shown. The forging in this form as it comes from thc 17 made up ofthat slight excess of metalV over and above what is needed for the body of the forging.

In Fig. 3 the forging is shown just prior to machining and finishing, and after the flash 17 has been trimmed from the body portion 13, and in this form the forging is cavity 15 and the depression 12 are so placed and formed as to give an interior form which lessens -very substantially the machining and boring which have to be done. In Fig. 4, the finished base plug is shown, and it will be observed that except for the interior borings, which are slighty there is but little change over the completed forging shown in Fig. 3. As stated, the outside of the forging will, of course, be machined to, a proper finish, but this. calls for only the removal of a slight amount of meta-l, in fact, practically nothing but the slightlyroughened skin ofthe forging as it comes from the press. The body portion 13 is screw-threaded as shown, it belng necessary to remove only so much of the metal as is necessary to give the proper threading; the cavity 15 is given a proper finish, and 10.5 the depression 12 is similarly machined out sel and brought to the circular form4 shown at 18 in Fig. 4. Such other boring and slotting as is necessary is of relatively slightcharacter so that it is obvious that the main part of the work is done by the die press, and but little of the laborious and slow machine work is necessary.

We claim l. A forging for fuse base plugs having a body portion, an annular rim of less diameter than said body portion projecting therefrom and having forged therein a censubstantially the area of the cavity of the.

finished plug and forming an upstanding annular wall rising from said body, and a projection from the other end of said body portion having formed therein a cavity or depression.

3. A for ing for fuse base plugs comprising a d1sk-like body portion of substantially the same size as the body of the finished plug, a projection from said body portion having a cavity forged therein of substantially the area of the cavity of the nished plug and forming an upstanding annular Wall rising from said body, and a second projection forged on the opposite end of said body portion and having formed centrally thereof a cavity or depression.

In testimony s et our hands CARL Gr. HEIBY.

JOHN BURKAM. DAVID E.v LINDQUIST. FRED L. RIGGIN.' EBENEZER W. ALLEN. RICHARD LAU.

whereof we have hereunto' 

